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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdbdf218c3f2e77c9d3eaeed7eff15e5c10615b8df43fdd36e3e551cd9fd321c' 
  AND token = 'bItYJAD3kmxZ7J0wgVmKRMaD2ci73NTmh4dhoHiimgM=' 
  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"
    }
  }
}