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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c2615a3c21a2cef5826c5133c614b513818cf95be664b7f1784e422f0b21827' 
  AND token = 'r3j1T+o4ZhCPb7CPR+i/gYu5CveheF1Y53zMNo8Kf+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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