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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c4d4e98eccc921e9519f86dc89ceaf63dfb85e24ec771845d4801bc8dd9245b' 
  AND token = 'M3m/aPMey21fLVLqmNJvVZ7wi8sQGp8p2AXljeI1QDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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