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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce0e206d1e489e71e667c9bec2c13fd5ddd0f6e952907261683068303e632bfa' 
  AND token = 't0DHEZph3LMlk2MnhgK3Qyn6PaFfG//7JH3hD8xIXYY=' 
  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"
    }
  }
}