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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13d7c2899c712959076759e9e1667515bc72459988d63d6e68449eb47e45ed57' 
  AND token = 'Eg3xjMlyEWEKc3K3cZpQjbR2mM8xEeGa2wteWLVoDqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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