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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07b010e75c222afe8b4ae14d30496449ee72350e175d521ec150c0ed1ae3d22a' 
  AND token = '2rHuwa4PxYa6msBjmXdhWFA+lw9oqSp/LdmBuaxAZUw=' 
  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"
    }
  }
}