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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e50b405c310afeea47f4bb7636cf8ae2cbad5d22fa37fbfa3c01bbbd44ff970' 
  AND token = '4iGbAlW1hcN201IsnVv6YkYTM7MZQmL9Nfv+gCobeG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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