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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69c8c30d3c931eab9d60dcd41aed4a00393d69d49b5cf84edc6d4fd52eed93ec' 
  AND token = 'zJNWYxkeyYD5H/7bj3G6hjRHPFMHXpLVT/s5NsRVVL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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