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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a2cd6183b965e3d0b1da47023f746443bb1395fb2b82b7dee0a95daa20b33c2' 
  AND token = 'gZwwW3mRKMvTmTEDVwUTms//j15BG3e9JKO9ceQ3BO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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