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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a0f185d722dfe6a44f9e4e6a2f987958ad28ca7ccdb8193d86bb967e8100a98' 
  AND token = 'S6j9qaCd90VaREJo2Q/j/UeV453DrL5hZCSyPjS56pY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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