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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea96d1f529e90a0646fd4e4cb7eedee511d265ee2abe9a61278b8846609cf111' 
  AND token = 'NBgDm4ACL9Q9N06lRT+DGBtxxBSRs4jQ1uNQ18FHHXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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