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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7170842295b62a6000e3fc15366e6d6ba208a50817e323fa6fd134c0abffac1' 
  AND token = 'sU1cD6MPxW4vdzTo4oXz3AeoT9lV3KymHSYDQU8Ress=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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