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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ffc3969d776f091b18f6ce629d7dc85cd94c96e8f119097bfe6e65802e9e1a8' 
  AND token = 'W+GQqC8cAuC9eDih1OxFrLKSnXZsWr7YmmURoX6JzX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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