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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ba2b8c55785c99d788bbe79197419e320b4414fc6b2a7c4064b6f27deefb770' 
  AND token = 'JrxzbyFnDStM46F/jrgnxC0Kzz7VSMQbIQ+NrAyHqv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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