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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77f3aa867073d78c81628b89820772e3a9c3916ad8dc6ea96e1c6bb8962ad661' 
  AND token = 'SxWgubj4U30MT722puXEgxgCgcNXpIK0WOFeupLSyB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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