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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5612a002aee7f94ce095a56ea88e747efea9561c213086d64f14402b13215ac' 
  AND token = 'LJy1GAl0Qgyh6adAi2+zL4GetXoFATzlDwT5kdBLSPY=' 
  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"
    }
  }
}