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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5d06d58bf4c89cd7e060edfeba45a6f7d0cbd3cdc242dd7bfbab70206cf0a34' 
  AND token = 'jq6r4U6ru+s4vErssA6v8z7BVl/ddQEnudkQ6Ho2Asw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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