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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19f289b38e5dd6f782fdacb1542a8b36e1c7f16a7d4d1d1023f979ac0ab61690' 
  AND token = '+93z83R8Koc7Aw/R4kuAlJI4Uyn9xX146Upx98FT2wU=' 
  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"
    }
  }
}