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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '699a48f5fb2976ff308d3a6cfbc0571936011a29a1be73b47d45c949ecd788bb' 
  AND token = 'ciSeb0m2MhSmCZgjYsRVNkwCXmG4jKDO7A0CxUA0ecA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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