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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c80caefb4b1b5dfadb3f485b592b30a33f5e7258c5f2b1b1cd24f51e39fdcef' 
  AND token = 'HP2m1RvN+KAEyPWmuUMIdtQ2wMw6O7yI2vP6GLKNR0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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