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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a916dc4425fe8a5c6254ca9e2a8d4c6157ccaa092ea1c32ceb8b4b927eb7cb4' 
  AND token = '2fXJLUcoHzDjZTewEQPvcfmIYKxZIda89PSk291/IhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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