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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8899331d9a59bfc5f7244d25de9ee9892f74b24aa203de06155c5cfcab836ab6' 
  AND token = 'DSClURoOiy3YN/6HpRvdfq02OE+pGtiNn2W2pEoj+r0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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