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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f25862a0222dbc381b552f0c91bfa32ed9ba3479876e2b2e8133fb0bb432efa2' 
  AND token = 'Cj/LcQCAElipz7Cp2bnMo/yYMC1YAbnIPQiy6UJHHao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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