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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aad1f237b1aecaba7bcf29f2fc1ab5e1dc10716fd0d2d79beefd0f8d80a1db2a' 
  AND token = '7CKTtZtetqmhyzUKnUpy5I/rQ9u5nGdf/MtPgkMyGeQ=' 
  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"
    }
  }
}