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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76fa31d0094f286ca11798dce96b0b6bf0d6186b41a1a316fec319f517467b0c' 
  AND token = 'YKAnF+V+pIflfJor1vdfs9fr5AbV2TCs5+VhPpS0iAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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