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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf6f83c0decc171e103255613ce1f3e4f5805558d4f9cf208c6b84405f8cd01' 
  AND token = 'Tx3HYyC/a2aB1jvYsp8+psm1eFdjBTqu8ih9rusfPdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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