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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fabaac77f8c30d4b33443a18d7398700d4ebca5381043b35753f1e8d05bfd85e' 
  AND token = 'Rkk82B2BDeok7PLm6MGSJauwNtTrTIccZFqtu51vuLk=' 
  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"
    }
  }
}