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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acc3871af0d51401c4aed885baa24d966eef0d99d3a083a5e0e104e880d90784' 
  AND token = 'z6KjuYrYCJCW+TooJTyRfA8S9Gf7ywU1a55uzTz+J0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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