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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d467f0f1015d98e6024189012f10ff65593d0a595473130e2ee9e8e7eb208cf' 
  AND token = 'B31KKIIBhnpt1v4dvGp3zW5QmxnEI24/aZdvSNYCsPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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