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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a89dbcd7295b660894fda4ed50041edea9a50da60e7a0ce3af1e67b27d3fbe6e' 
  AND token = 'qTbDTNg9X5GNbJsCX962qEggzHlWpbDj79eMnCz05Wo=' 
  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"
    }
  }
}