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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08a5f3ff35291f0be036b28e50088a50d235bfc428169d5977e66b934f4e2126' 
  AND token = 'aTd71e6jM+vs6nxM3PsY2w3KkJn9Acx2K9wz9M5dE94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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