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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ca7719e9571bd598b9e38d50a02fc8e8a805e0f648b7991f8f4499ccb8c9270' 
  AND token = 'mRCSEOODv03RWS6oWytDQ6NNgplVpu1So+VSIGCeZTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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