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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4f2b5c903460a8ae90ab0031da869247d472acfe9ddbb7362f16b2e6fe3bbb7' 
  AND token = 'WIW6UqnWt+AUSe7Ls0Qc/CIZM8gGVtwMNdkpsT2ogeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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