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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1e35cdbd8b33eb79009460891e4d4273926a7db0007c9390e726a1e06c66573' 
  AND token = 'zWiN49+1U5G8HLhf1zRaWuSgTjeFVSBQyza5p2R58jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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