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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '542cbb699ee15df8ce584ce7d0e8ee5347916f4f373c1884984e1c986e260a16' 
  AND token = '6dHWF7MIHmPnxaw0jkyoNjkyTmpCzyoY5/lSoE1mMDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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