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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0240b383a9a26c1582644e602e052fd4a2cc0c533cc4deb069b9918b7cae8ca4' 
  AND token = 'ycJCKCSiG/PL1Q9y4qs47g7CCLEp1sgmWeL6VHr/2eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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