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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e2e8ff59288aa56551aeea15e5d77383472d3e4afdcba2639fde4539c25c221' 
  AND token = 'CAZj15HMxB9eh5sU+9AmaE706T9S4fo1KP6Jt7IbJ4s=' 
  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"
    }
  }
}