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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1a15903d55da52e234e3481039de325caad3e06f603abbb16ea6ecc0c5eb4ef' 
  AND token = '9p0EsWLfZ2iC7EqHw5sVaw5nRN2c0NsU13uoNRrrEZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}