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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e96bd0b05be9e7ffb1ba8bd129a9e51e5c13311807d80c1a9de242d653244008' 
  AND token = 'P5SXfOoGpj1B8u8e1/qxwG+LyLoLh3fq13ll3fMlhhM=' 
  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"
    }
  }
}