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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '913016737eb9a7ebb00d5defd800911ea9ab6b79f17d0fc8363c78d13bc57248' 
  AND token = 'YgV/HH7s523PRwcH43tZjw06BIEDX9V7tqtryO4p0tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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