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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f7a094a2eb2b26b8f2a1bbedb9411276ecee59d523f7f10d34d32f1d19dd5d2' 
  AND token = 'vfP1GiG83HKV01wgCQhfcT2FOeg9zTqoRcbME41shN4=' 
  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"
    }
  }
}