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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70499586f2922b2f8ec0d83d55d41ad850c800a1a03f926ec1907471db1d45c3' 
  AND token = '4JQqp6fWLAXIT/PrYyvRE2oC3cAKZCBRhn9cN9kUk5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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