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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f4ebf2bd1f0b1c02cf456ae3f460e33510537c58d54da289fdfda14661229f' 
  AND token = '+FGbIc/CQCiyr+BFj1hTD1on9bPkeMQ5j2ojr4UTDss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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