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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b466551ee5f94a8f59fe4c1fe8c62323b40886fa1d6a83450287c30d0f515bb' 
  AND token = '232gvrhsYP8/FIsB0UlMxezevtjAyG358Ri7DEqzn7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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