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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90e19278ec9a125f4085b2f8b1704f643680feaa42e4675e63309b3854e210d2' 
  AND token = 'zVGb+coggvbQczj9lLRwcwW+IXD0wCjI9hdY28eH0i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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