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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4cba5052ed86f53ea1a0757312052373e4f3c9d69ce25c78e8e7bc719db5309' 
  AND token = 'hB4Mc7+lcS4jXHvFfiCheYsYEfU0cLbqXz5HjXJxNwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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