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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd18cd8c09e60b99e87b10d4bbf11a3692d45f0355ac23751264c4724c6720ace' 
  AND token = 'Tk8Ux7SrpxEfTV1f4PFmu/sXnLVNrp0fODu+TZ7lV/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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