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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45a2c8d82e81ba4c1bdc29d5308afd32d6ab82fae9127fe1681b955b22852a0e' 
  AND token = 'yV4SyCCt4ojdvSh8r07Mzfp3kwL94O5Z23SCrOmn2YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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