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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0c265d81f2abef78c6b447546635789ec979949400a9bd4644146dec6f70a5e' 
  AND token = '3QRvy3SrJmROsxHsDcd3y2AhZ2ufoKFqFwbvqn62MVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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