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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '653f4a090fd70f50dc3db8c9bb4ff167bf20e3b25eddbb9a9589f4d1bce456ec' 
  AND token = 'xNTAGAV45K1gsIxHNpnl1wmd+g2Rs6w4tdcHqlM/DPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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