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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb4885aaf034d37c8e7bec7182e715f8e4d4e8974d03b7148893ea0d4724403d' 
  AND token = 'yj2+DqVi3xvJ5mzhbIsMfbgYm79CXgdqCECGqzDrLWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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