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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd942c7cf8f214e8e1b35538c379952bd21af10ee1afbf6913ed23b8e6ef44dda' 
  AND token = 'H8gIIjy3wfE4pl7zt9cn//k1DFCVY99c0R9IAKEkuEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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