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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6457a1d03cbecfffb2f34d28ec49648ecf9a8ffcc785214e1b67ce772044169f' 
  AND token = 'G0JEQ61KxdNHc20Y/rBhT9XOua/Xng4Fnb9d26ebbBc=' 
  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"
    }
  }
}