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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83d19e598866b1c4ed3bb331e2a796ef7aaa3dca5aec9654e029b628b9180a82' 
  AND token = 'ZHDBF0zcUQeY6DFxGFQJLC2e2UHQ+16Fp7saI/LMJqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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