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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afdadf878f3e96728f0212a1dcdd9bd8aeb277164499a5caa0e3dec1a01c2333' 
  AND token = 'bo1GtF9wXRgWfeL6SoZkTEHvF1jktu3FcLxGW1gN/po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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