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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cafddb50069c3ad4c305d1e52f521db3c10312c0c40e3554ed65a62326fe01a' 
  AND token = 'z+TGls0aggLlY5p1WbrGecsOvxTzfJK2luHYsJnwW60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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