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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36d76f25318aae15b0fd710153574260b2cff9ec415b0907c85d9b51a5f738ce' 
  AND token = 'I9mk8OnoLr7Ag7t0BL0MW1gSIksDBys3kuIcdAimrVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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