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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8f07e1d1317d39fe8dc25baec6df0d891b6b5e3ee39ba69693056f14ec277d8' 
  AND token = 'cbVHV+Q80Om7Pv4l+DtvsOUKghq3rreM1YLxW6pmYQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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