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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe7437a4609c88e4bec04fafc2fb0c14ff1821d7884bae88fc34ed074d84936f' 
  AND token = 'nBads95IapXxW3Udzrhv2eh/aLEdHwHK61XzlyBYJXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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